So I have a couple dalmation mollies and a couple balloon mollies. When I got the dalmation mollies, one of the balloon mollies greatly welcomed one of them with some lovin'. Well lately it hasn't been acting right. It's tail is kinda dragging and just not acting right. How can you tell if it might be pregnant (other than a big belly)? Do they usually have symptoms before their belly gets big? Is there anything I need to do to keep it alive, or a certain type of temp?